Overwatch has fallen. The Omnic Crisis never ended. Humanity struggles against a seemingly immortal enemy. This is the story of those fighting to survive in a world no longer ruled by men.

Yamato, Iowa, the never completed Montana. They're all powerful ships, but all are inferior 'it'. The U.S. made a breakthrough in military technology, designing a battleship that could sink thousands of Yamato's, Iowa's, and Montana's alike. A true demon that would rule the sea's forever, but they never completed it, and soon abandoned the project. Or did they?